參數(shù)資料
型號: INSTRUCTIN603EWP
英文描述: Optimizing the Instruction Execution on the 603e
中文描述: 優(yōu)化了603e的指令執(zhí)行
文件頁數(shù): 17/54頁
文件大?。?/td> 325K
代理商: INSTRUCTIN603EWP
RISC Microprocessor Division
Page 17
When the fetcher fetches instructions into the instruction queue (IQ), it also forwards them to the
branch processing unit (BPU), which scans these instructions for branches. The BPU immediately
begins address calculation for branches found and attempts to fold certain branches out of the
instruction queue (discussed later).
Because branch instructions can change the instruction flow, they can potentially cause stalls in the
instruction pipeline when new instructions must be fetched from the target address. The 603e includes
two mechanisms for reducing the impact of branch instructions: branch folding and branch prediction.
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